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Abstract

The tachometer system illustrated is capable of providing a wide range of speed measurement, at relatively low speeds, and with relatively high accelerations.

Country

United States

Language

English (United States)

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Electronic Tachometer

The tachometer system illustrated is capable of providing a wide range of
speed measurement, at relatively low speeds, and with relatively high
accelerations.

A rotary transducer 5 is mechanically attached to a shaft such as the shaft of
a motor 7, the characteristics of which are to be measured. The output of the
rotary transducer 5 is preferably a pure sine wave whose frequency is
proportional to motor RPM. Any DC component of the transducer output must be
eliminated. For the harmonic distortion and noise to be reduced, the transducer
signal should be band-limited. In addition, because the peak-to-peak transducer
output voltage will be low, this signal will have to be amplified. These
requirements can be satisfied by amplifier and filter 9. The output of 9 will be a
band-limited signal in which, it will be assumed, each frequency within the band
is amplified equally with gain A.

The output of 9 is multiplied by a constant sine-wave carrier frequency
supplied from carrier oscillator 11, which has been processed through a band-
pass filter 13 to help eliminate any DC or harmonic distortion. The multiplication
is carried out by an analog multiplier 15. The results of the analog multiplication
are the same as an AM modulated signal with suppressed carrier. No additional
phase information is added for the carrier, because it can be assumed with any
given set of sine waves that one of them has zero phase with respect to the
others.

Both the upper and lower sidebands of the analog multiplier signal contain
information regarding the motor RPM. The upper sideband signal will yield a
band-limited signal with the carrier frequency as a lower bound. If the carrier
frequency is high enough, using only the upper sideband will assure that no
unwanted frequencies will be in th...